The Uno interface is based on the ATmega328 microcontroller.
It has 14 digital inputs / outputs (6 of which can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power supply, an ICSP connector, and a reset button.
It contains everything needed to drive the microcontroller; just connect it to a computer with a USB cable (provided) to use it easily.

characteristics

• Microcontroller: ATmega328
  
• Nominal operating voltage: 5V
  
• Digital inputs / outputs: 14
  
• Analog inputs: 6
  
• Flash memory: 32 KB (ATmega328)
  
• Clock frequency: 16 MHz